替换查找单个字可变大,3．界面上增加目录树，实现快速导航,增加打印、打印预览、页面设置,5．增加状态栏的显示和设置,字数统计功能、拼写检查功能、自定义工具栏、系统配置信息设置-Find a word to replace a single variable, and 3. Interface to increase the directory tree, for fast navigation, increase printing, Print Preview, Page Setup, 5. I